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CVE-2026-33192— free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques

EPSS 0.01% · P3
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I. Basic Information for CVE-2026-33192

Vulnerability Information
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Vulnerability Title
free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques
Source: NVD (National Vulnerability Database)
Vulnerability Description
Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to 1.4.2, the UDM incorrectly converts a downstream 400 Bad Request (from UDR) into a 500 Internal Server Error when handling PATCH requests with an empty supi path parameter. Additionally, the UDM incorrectly translates the PATCH method to PUT when forwarding to UDR, indicating a deeper architectural issue. This leaks internal error handling behavior, making it difficult for clients to distinguish between client-side errors and server-side failures. The issue has been patched in version 1.4.2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过错误消息导致的信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
free5GC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 free5GC 1.4.2之前版本存在安全漏洞，该漏洞源于UDM在处理具有空supi路径参数的PATCH请求时，错误地将下游400错误请求转换为500内部服务器错误，并错误地将PATCH方法转换为PUT，可能泄露内部错误处理行为。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
free5gcfree5gc < 1.4.2 -

II. Public POCs for CVE-2026-33192

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III. Intelligence Information for CVE-2026-33192

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Same Patch Batch · free5gc · 2026-03-20 · 7 CVEs total

CVE-2026-32937free5GC CHF has Out-of-Bounds Slice Access that Leads to DoS
CVE-2026-33062free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter
CVE-2026-33063free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion
CVE-2026-33064free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference
CVE-2026-33065free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscripti
CVE-2026-33191free5GC UDM vulnerable to null byte injection in URL path parameters causing 500 Internal

IV. Related Vulnerabilities

Same product: free5gc
Same vendor: free5gc
Same weakness: CWE-209

V. Comments for CVE-2026-33192

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